Ventilator.



J. KEITH.

VENTILATOR.

APPLIGATIONI'ILED APR.25, 1911.

3 SHEET SSHEET 1.

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J. KEITH.

VENTILATOR.

APPLICATION FILED APILZS, 1911.

1,028,221 Patented June 4, 1912.

3 SHEETS-SHEET 2.

J. KEITH.

VENTILATOR.

APPLICATION FILED APR.25, 1911.

3 SHEETS-SHEET 3.

I a n wflffozucx 39V Uwuud JAMES KEITH, or LONDON, ENGLAND.

VENTILA'I'OR.

Specification of Letters Patent.

Patented June 41 1912.

Application filed. April 25, 1911. Serial No. 623,274,

To all whom it may concern: n

Be it known that I, JAMEs KEITH, a subject of the King of Great Britain,residing at London, England, have invented a new and useful Improvementin Ventilators; and I do hereby declare the following to be a full,clear, and exact description of the same.

"feeling of draft To accomplish this object I have provided a ventilatoradapted for suitable connection with the outside. air and having acasing inclosing a suitable fan, practically the whole of thecircumference of the casing being formed of wire gauze throughwhich theair is-forced into the 'room and so difiused and delivered through thecomparatively large area of gauze, thatno perceptible draft is felt, al-

though the feeling of freshness will be prescut all the time and any-'stufiiness in the room or apartment will be prevented and goodventilation assured: I also provide means whereby the cold outside airmay be diluted with air taken from the room, the mixture thus obtainedbeing passed through the fan and gauze as just described. l he inletconnection for the admission of the outside air may be through asuitable conduit adapted to ,be placed through a window frame or"through a screen placed inthe lower part ofthe window. Or thisconnection may be through a conduit placed in the top of a hollow columnplaced 1n the room and communicating with the outside air.

I also provide means for filtering, purifying, disinfecting or perfumingthe air passing through the ventilator. This means may consists of anoutside envelop of muslin or other open fabric or other flexible coverwhich may be secured around the apparatus and kept inflated by the airpressure from within.

When desired the space between the gauze and the covering may be filledwith cotton wool or other substance.

The covering would be used with or withunder the sash 14 is shown inFig. 1.

out the filling; and the covering when used alone, or both the coveringand the filling could be used dry or could be moistened withdisinfectants, perfume, medicinal or other liquid.

Ventilators, showing by way of example possible embodiments of thisinvention, are illustrated in the. accompanying drawings, in which, i

2 Figure 1 is an end elevation showing a ventilator applied on theinside of a window, Fig. 2 is a longitudinal vertical sectional view ofthe same. Fig. 3 is a vertical sectional view taken on the line 3-3 ofFig. 2. Fig. 4 shows a horizontal section taken on the line 1 l of Fig.2. Fig. 5 is an elevation of another form of ventilatorand placed on'the top of a column. Fig. 6 is a vertical sectional view of the same.Fig. 7 is a transverse sectional view. Fig. 8 1s a horizontal sectionalView of the same. Fig. 9 is a longitudinal sectional view showing thefiltering or disinfecting means applied to the first form of theinvention. Fig. 10 is a transverse ,vertical sectional view of the same,and Fig. 11 is a side elevation showing the filtering and disinfectingmeans applied to the second form of the invention.

Referring more particularly to Figs. 1 to 4, the ventilator is shownprovided with a casing 10 the main body of which may be constructed ofstamped sheet stcel, light cast iron or any other suitable material. Thelower part of the casing is provided with an outer inlet-conduit 11 andan inner inlet conduit 12, the outer conduit being adapted for placingthrough the window frame or through a screen l3'in the window The innerconduit 11 is provided with a flap door 15 which may be adjusted for anywidth of opening.

The ends of the casing are approximately circular in shape and areprovided with flanges 16 to which are attached the edges .of the wiregauze 17, said edge being held in place by rings or bands 18 secured tosaid flanges by counter sunk screws or in any other manner.

The inner end wall 19 may be concaved, and has mounted centrallythereon, an electric motor 20, the armature shaft of which passesthrough said wall and has mounted thereon the fan 21. It is understood,however, that other motive power may be used.

This fan may be of a form similar to that 1 of my applications SerialNumbers 588314. and 602885 for Letters Patent in the United States, orit may be any other suitable open fan. As illustrated, the blades 22 ofthe fan are somewhat curved and inclined from the radial direction, andare secured to the disk 23 by which they are supported on the shaft, andhave their outer ends braced by a ring 22.

y A partition 25 divides the lower part of the casing from the partadjacent to the gauze, the intermediate part of this partition beingprovided with a circular opening 26, the edge of which is adjacent toand approximately in register with the ring 24.

The operation of the device is very simple. During weather which is notvery cold, the door 15 is closed and the fan draws its entire supply ofair in through the conduit 11 and forces it out through the gauze 17.The air is distributed by the fan, and being also under pressure passesout over the entire area of the gauze, and is thus evenly diffused anddistributed in all direc-" tions. If the weather is so cold that thevolume of air passing through the ventila;

tor directly from the outside would unduly lower the temperature of theroom in the neighborhood of the fan, the door 15 is opened to a suitableextent so that the air passing through the ventilator is diluted to thedesired amount with the warm air of the room, the amount of fresh airtaken directly from the outside, however, being.

. sufiicient to properly ventilate the room.

. column the casing 30 rests. This column is The principle of theventilator illustrated in Fi s. 5 to 8 is the same as that of ventilatorin Figs. 1 to 4 but in the second form, the casing 30 has both endssubstantially alike and is provided with a central downwardly projectinginlet conduit 31 forthe cold air and a pair of warm air inlet openings32. The conduit 31 is received in a duct 33 of the column 33, on top ofwhich placed within the room at a suitable height; and the duct 33communicates with the outside air. The openings 32 are provided withsuitable doors 35. In this form the armature shaft of the motor 40passes from end to end of the casing and is provided centrally withdouble inlet fan composed of a pair of fans 41 similar to the fanhereinbefore described, and having the disks 43 suitable or desiredsize.

taining the fans and limited by the gauze 37 while the lower partcommunicates with the conduit 31 and the openings 32. .The partition isprovided with two openings 46 one for each fan.

In operation air is drawn in through the duct 33, the conduit 31 andpasses out through the gauze 37. The doors 35 may be opened to dilutethe cold air with warm air from the room.- M

The first form of the inventionis particularly adapted for windowventilation and would naturally be of small form; while the second formis particularly adapted for larger work and can be made of any In eithercase the taking in of acertain amount of the air from the room or.apartment dilutes the fresh air coming in and also keeps the air incirculation and also takes off the chill of the fresh air in coldweather. However, the ap paratus could be made without the openings 12and 32 if desired.

In both forms the air being supplied under pressure to the fine gauze,forces through the gauze any dust particles or the like which wouldotherwise tend to clog the gauze.

These ventilators effect a plentiful supply of air at all times andseasons by the expenditure of a minimum amount of electricity andwithout any perceptible draft, the

air being supplied under slight pressure and I so difi'used,modified andminutely delivered under pressure through the gauze over a comparativelylarge ag'ea that its presence flowing into the apartment or room involume .will not be felt within a couple of feet from the gauze,although the feeling of freshness will be present all the time andstulfiness avoided and good ventilation assured.

Various changes in the construction and Y details of these ventilatorsmay be made without departing from the spirit and scope of theinvent-ion as claimed.

I may provide a -filteringand disinfecting means as shown in Figs. 9 to11. This means consists of anenvelop or covering 50 which may befastened around-the gauze of the casing and secured under the rings 18or in any' other convenient manner. This envelop. will be kept inflatedby the air res sure from within and will assume the ormt places eitherfor drying the air, for disin fecting, perfuming or for impregnating itwith medicinal substitutes.

I- claim as my invention: 1. Ina ventilator, the combination of a hollowbase formed as an open ended condu'it, an archshaped chamber erected onsaid base and 1n communication with the 1nterlor of said base, saidarch-shaped chamber having a vertical wall formed with a inlet centeropposite said circular opening,

said fan runner adapted to draw air through the hollow base and throughthe circular opening and to discharge it tangentially into the spacebetween the chamber and the perforated covering.

2. In a ventilator, the combination of a' hollow casing including ahollow base formed as an open-ended conduit and an incompletecylindrical part erected on said base, the cylindrical part having aperforated circumferential wall and imperfor'ate two subscribingwitnesses.

end walls, an arch-shaped chamber disposed within the cylindrical partand communicating with the interior of the hollow base, one end wall ofsaid chamberbeing constituted by part of one end wall of the cylindricalpart, the roof and second end wall of said chamber affording a partitionbetween the interior of the cylindrical part and'the base, the secondend wall of the chamber having a circular opening and being spaced fromthe second end wall of the cylindrical part, and a centrifugal open fanrunner disposed between the second end wall of the chamber and thesecond end wall of the cylindrical part, the inlet center of said fanrunner being disposed opposite said opening, said fan runner serving todraw air through the open end of the base and through the said circularopening, and to discharge such air through the perforations in the saidcircumferential wall.

In testimony whereof, I have signed my name to this specification in thepresence of JAMES KEITH.

' -Witnesses:

WM. H. BERRIGAN, AMBROSE L. OSHEA.

